 class Person{
    public String name;
    public int age;
    public final void fun(){
        System.out.println("哈哈");
    }
}
class Student extends Person{
    public  int age=10;
    @Override
    public void fun() {
        super.fun();
    }
}
public class Test {
    public static void main(String[] args) {
        Student s=new Student();
        s.age=19;
    }
}
